Clamping system with polygonal receptacle for a hollow shaft

Abstract

A spindle for a polygonal hollow-shaft taper is proposed which permits optimal use of the interior of the spindle for receiving a clamping system and an optional cylinder structure.

1 - 19 . (canceled) 
     
     
         20 . A spindle having a recess ( 11 ) which comprises a centering receptacle ( 7 ) for an adapter ( 2 ) having a polygonal outer contour and hollow shaft, an annular groove ( 65 ) and a receiving bore ( 9 ), wherein a clamping system ( 4 ) is arranged in the receiving bore ( 9 ), wherein the clamping system ( 4 ) has a collar ( 67 ), wherein the collar ( 67 ) has a polygonal outer contour, or the outer contour is formed by a plurality of lugs, wherein the collar ( 67 ) fits through the centering receptacle ( 7 ) in at least one position, and wherein an at least one-sided positive-locking fit is established between the collar ( 67 ) and the annular groove ( 65 ) by rotating the collar ( 67 ) relative to the spindle ( 1 ). 
     
     
         21 . The spindle according to  claim 20 , characterized in that a diameter of the annular groove ( 65 ) is as large as or greater than a circumference of the collar ( 67 ). 
     
     
         22 . The spindle according to  claim 20 , characterized in that a width of the annular groove ( 65 ) is as large as or greater than a width of the collar ( 67 ). 
     
     
         23 . The spindle according to  claim 20 , characterized in that an inscribed circle of the smallest polygon of the centering receptacle ( 7 ) is smaller than the circumference of the collar ( 67 ). 
     
     
         24 . The spindle according to  claim 20 , characterized in that the annular groove ( 65 ) is arranged at the transition between the centering receptacle ( 7 ) and the receiving bore ( 9 ). 
     
     
         25 . The spindle according to  claim 20 , characterized in that the collar ( 67 ) is formed at a front end of a housing ( 19 ), and in that the collar ( 67 ) or the housing ( 19 ) is secured in a positive-locking fit against rotation in the spindle ( 1 ). 
     
     
         26 . The spindle according to  claim 25 , characterized in that a securing pin ( 71 ) is inserted into the spindle ( 1 ), and the securing pin ( 71 ) dips into a recess of the collar ( 67 ). 
     
     
         27 . The spindle according to  claim 26 , characterized in that the recess ( 69 ) is arranged at a high point of the polygonal collar ( 67 ). 
     
     
         28 . The spindle according to  claim 26 , characterized in that the recess ( 69 ) is arranged in a lug of the collar ( 67 ). 
     
     
         29 . The spindle according to  claim 25 , characterized in that a securing pin ( 71 ) is inserted into the spindle ( 1 ), and in that the securing pin ( 71 ) dips into the annular groove ( 65 ) next to a high point ( 7 . 1 ) or a lug of the collar ( 67 ). 
     
     
         30 . The spindle according to  claim 20 , characterized in that the receiving bore ( 9 ) is designed as a polygon at least sectionally. 
     
     
         31 . The spindle according to  claim 20 , characterized in that the one or more pistons ( 27 ) are also designed as a polygon if the receiving bore ( 9 ) is designed as a polygon. 
     
     
         32 . The spindle according to  claim 20 , characterized in that the collar ( 67 ), or the collar ( 67 ) and the housing ( 19 ), are rotatable relative to the rest of the clamping system ( 4 ) or a cylinder structure ( 6 ) arranged in the receiving bore ( 9 ). 
     
     
         33 . The spindle according to  claim 20 , characterized in that a cylinder structure ( 6 ) for actuating the clamping system ( 4 ) is arranged in the receiving bore ( 9 ), in that the cylinder structure ( 6 ) comprises a piston rod ( 3 ), in that the piston rod ( 3 ) has a central bore ( 47 ) for supplying a tool clamped in the clamping system with a medium, and in that the piston rod ( 3 ) penetrates a seal support ( 59 ) and ends in a supply space ( 53 ) of the spindle ( 1 ). 
     
     
         34 . The spindle according to  claim 33 , characterized in that the seal support ( 59 ) comprises a flange ( 75 ) and a threaded section ( 77 ) having an external thread, in that an annular groove ( 79 ) is formed between the flange ( 59 ) and the threaded section ( 77 ), in that a gap is formed in the region of the threaded section ( 77 ) between the piston rod ( 3 ) and the seal support ( 59 ), and in that at least one bore ( 81 ) connects the annular groove ( 79 ) and the gap to one another. 
     
     
         35 . The spindle according to  claim 34 , characterized in that at least one bore ( 55 ) is provided in the spindle ( 1 ), and in that the bore ( 55 ) opens into a space delimited by the annular groove ( 79 ) and the spindle ( 1 ). 
     
     
         36 . The spindle according to any of  claim 33 , characterized in that at least one seal ( 51 ) is arranged in the seal support ( 59 ). 
     
     
         37 . The spindle according to  claim 20 , characterized in that it is part of a driven tool holder or a stationary tool holder. 
     
     
         38 . A tool holder comprising a spindle ( 1 ) and a mechanical interface for fastening to a turret of a lathe or a machining center, characterized in that it has a spindle ( 1 ) according to  claim 20 . 
     
     
         39 . The tool holder according to  claim 38 , characterized in that the spindle ( 1 ) is rotatably mounted or fixed in the tool holder.